Hi : I am new in Django, and I meet a bug. I was upgrade django from 1.5 to 1.8.
My Django environment now is : Django 1.8.5 with python 2.7.10 This is my auth models: Class Card(models.Model): cardgroup = models.CharField(_('CardGroup'), max_length=60) cardname = models.CharField(_('CardName'), max_length=60) disabled = models.BooleanField(_('disabled'), default=False) objects = CardManager() class Meta: unique_together = (cardgroup', 'cardname') def __unicode__(self): return self.name @property def name(self): return '%s_%s' % (.self.cardgroup, self.cardname) Class Factory(models.Model): sort = models.CharField(_('Short Name'), max_length=20, unique=True) address = models.CharField(_('Factory address'), max_length=20) cards = models.ManyToManyField(Card, blank=True) def __unicode__(self): return self.short After "#python manage.py migrate" twice , I got a error: ValueError: Lookup failed for model referenced by field core.auth.Factory.card:core.auth.core.auth.Card Because of that, I cannot syncdb ,either. My auth apps was included in a core floder. Help me fix the bug, please. I was coming unstuck for a mouth. -- You received this message because you are subscribed to the Google Groups "Django users" group. To unsubscribe from this group and stop receiving emails from it, send an email to django-users+unsubscr...@googlegroups.com. To post to this group, send email to django-users@googlegroups.com. Visit this group at http://groups.google.com/group/django-users. To view this discussion on the web visit https://groups.google.com/d/msgid/django-users/a811320a-efb8-425f-aa0c-bd68df4191f9%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.